SilencerCo Threaded pistol barrels are precision machined from heat treated 416R stainless steel. These barrels feature a durable, corrosion resistant matte black Nitride finish. The barrel features a 1:10" twist rate, and this particular barrel is threaded 1/2"x28. This is the perfect item for turning your run of the mill Heckler & Koch VP9 in a suppressor ready host.